Tone-control device



Oct. 23, 1928. 1,688,952-

A. G. WEEKS TONE CONTROL DEVICE Filed Jam 25. 1927 in the Figure 2.

outer peripheral surface of said cap to be flushly arranged with the corresponding peripheral surface of the body as is shown The chamber formed within the hollow cylindrical tone control device is provided with several openings, such openings being formed in its end walls constituted by the cap and the end of the body portion 9, such open- 7 or concaved or dished as indicated by the numeral 14; the opening 13 being arranged concentrically with respect to this curved or dished portion 14, as is shown in the Figure 2, while the outer portion of said opening is preferably beveled as indicated at 15 whereby to decrease the thickness of the adjacent portions of this particular end wall through which the modulated sound waves are discharged into the transmitting or sound intensifying device, such as the amplifying horn 2. Also, it is of moment to note hereat that the opening 12 within the opposite end wall of thesoundchamber within the tone control device is arranged in longitudinal alignment with the opening 13 and concentrically of that particular portion of the cover like cap 10 in which it is formed. Thus, the said opening 12, together with the opening 13 will be arranged approximately concentrically of the respective nipple-like extensions 7 and 8 so that they will effectually function in the re ceiving and discharging of sound waves into and from the tone control device.

Through the medium of the chamber formed in the tone control device constituted by the elements 9 and 10. hereinbefore described, I provide an effectual sound reverberating chamber into';which the comparatively impure sound waves from the dia phragm of an equi ped reproducing device or unit are adapte to be discharged. Because of the reverberatory action of the ch amber, those sound waves discharged thereinto,

upon being reflected ontothe dished or curved end wall 14 will find outlet from the device by way of the opening 13 into the amplifying device 2, such discharging sound waves being of pure or virgin tone values, the pitch of which may be regulated by a user of the device through relative longitudinal adjustment as between the component parts 9 and 10 of the tone control means.

In the Figure 4, I have shown a slightly modified formof the improved control device. Herein, said device consists of a body portion 9 and a cap-like cover 10, the interengageable parts of said body portion and said cap like cover 10 being formed with complemental screw threads 16 whereby these latter may be turned onto the former and by such turning, may be longitudinally adjusted so that the opposite end walls of the sound reverberating chamber constituted by the interior of the tone control device will be varied in their respective spacing,-and hence, will be rendered selective in the p oduction of sound waves of the desired pitch tr volume from said control device.

The opposite end walls of the tone control device constituted by the elements 9 and 10 are formed with concentrically arranged and longitudinally aligned inlet and outlet ways 12' and 13', whereas that thickened en d wall of the device receiving or having the opening 13 formed therein is dished or curved as indicated at 14.

That the elements 9 and 10 of the modified tone control device may be secured in their relatively adjusted positions for the produc- 'tion of sound waves of the desired pitch or volume, I engage in a screw threaded opening formed in one side of the housing or casing 4 of the attachment, a locking screw 17, the inner end of which is adapted to have binding engagement with an adjacent portion of the body 9 of the tone control device, whereby that particular element will be secured against rotative movement with respect to the cap-like cover elements 10 and consequently thereupon, will serve as a means to retain the opposite end walls of the sound reverberating chamber in their respective fixedly adjusted positions subsequently to an adjustment to the desired or proper nicety.

As hereinbefore stated, I have shown for purposes of illustration, my improved tone control device as being adapted for use in connection with the so-called radio loud speaker device. The invention, however, as will be readily appreciated by workers skilled in the art, may be equally well and as advantageously adapted for'use in connection with various other sound reproducing devices or telephones or, if desired, it may be advantageously used in connection with sound reproducing devices of phonographs and like intelligence re producing devices. Furthermore, if desired, the hollow cylindrical tone control device may be made solid, that is, it may be cast in a single piece without the cap like cove-r element hereinbefore designated by the numerals 10 and 10, although for purposes of permitting adjustment of the device to produce tones ora selective volume or pitch, it is preferable that the device be formed of the body portions and the cap-like cover portions hereinbefore identified. Similarly, various mechanical means or equivalents may be employed in lieu of the meansspecifically illustrated and described herein'for retaining or locking the component parts of the tone control device in relatively adjusted positions.

Manifestly, the construction shown is ca pable of considerable modification and such modification as is within the scope of my claims, I consider within the spirit of my invention.

- the opening in said thickened end Wall being arranged concentrically of the dished face.

2. A tone control device comprising a hollow sectional body having end walls provided with openings, the sections of said body being longitudinally adjustable with respect to each other, means for securing the body sections in relatively adjusted positions, one end wall of said body being thickened and having its inner face dished, the opening in said thickened end wall being arranged concentrically of the dished face thereof, and a rigid casing receiving and supporting said body and having sound inlet and outlet ways therein communicating with the openings in said body.

3. A tone control device comprising a see tional body, the sections of which are adapt ed for relative longitudinal adjustment, said body having opposed resonating surfaces formed upon the inner sides of the opposite ends thereof, one of said ends being thickened and having its particular resonating surface formed by dishing said inner slde of the same, and each of the ends having concentric openings therein.

4. A tone control device comprising a sectional hollow body, the sections of 'Which'arc adapted for relative adjustment, the end wall of one of said sections being thickened and having its inner side dished and a concentric opening formed therein and the end wall of the remaining section having a plane inner side formed with a concentric opening.

5. A tone control device comprising a hollow body having end walls and constituting an unobstructed chamber, said walls being provided with openings, one end wall having its inner surface dished to form a resonating surface for the greater portion of its area and the'opening therein being arranged concentrically of said dished portion.

6. A tone control device comprising a hollow body havin end walls and constituting.

an unobstructe chamber, said walls being provided with openings, one end wall of the body being thickened-and the inner surface of said end wall being dished and havin the opening therein arranged concentricaly of the same.

7. A tone control device comprising an aid-- dished face. A a

8. A tone control device comprising a hollow body having end walls and constituting an unobstructed chamber, said end walls hav ing concentric sound admitting and emitting openings and forming opposed resonatin surfaces for said chamber, one of the en walls being thickened and having its resonating surface formed by gradually reducing the same towards the opening therein.

9. A tone control device comprising a hollow body having end walls and constituting a reverberating chamber, and a casing having sound discharge ways-snugly receiving said body and supporting the same against mate rial vibrating motion.

In witness whereof I have hereunto set my hand.

ALBERT G WEEKS.

70 wall being arranged concentrically of the 

